ERROR [2110]: MASS MPC OR RBE MASS CANNOT BE DIRECTIONAL IN EXPLICIT DYNAMIC ANALYSIS

Cause

This error is generated when the mass matrix retains the directionality at the nodes retaining independent DOFs of MPC (Multi-Point Constraint) or at the nodes constituting rigid body elements.

Analysis Type

Explicit dynamic analysis (explicit nonlinear transient)

Related Menu

[Not Applicable in FEA NX]

Mesh >> Element >> Create >> Other >> Rigid Link...

Analysis >> Boundary >> Constraint Equation...

Remedy

The mass matrix of the nodes, which retain independent DOFs of MPC or constitute rigid body elements, must not retain any directional properties, so a careful use of elements must be practised.  Especially when the mass matrix is directly entered by using mass elements, directional properties must not be included.  In other words, the mass matrix must only have the diagonal terms whose X-, Y- and Z-direction components must be all equal.